A correction for the wrong part:
(defn my-max ([x y] (if (nil? x) y
(if (nil? y) x
(max x y))))
([] nil))
(defn tree-value ^double [tree evaluate ^long depth]
(let [children (:children tree)]
(if (or (zero? depth))
(evaluate (:board tree))
(let [^double res
(r/reduce my-max
(r/map
#(- (tree-value (:tree %) evaluate (dec depth)))
children))]
(if (nil? res) (evaluate (:board tree))
res)))))
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